The first version of IEFBR14 delivered with MVS must have been the shortest, incorrect version of a
program ever delivered by IBM (or anybody else).
The first version consisted of the line
BR 14
, which is just a "return to caller."
Rather useful, as a NOP in JCL.
And it would have been perfect, had it set the return
code to 0.
The next release fixed the bug by adding another line, so the current version now reads :
SR 15,15
BR 14